Malaysia SPM Form 5 Physics - Electromagnetism

1.1 Introduction to Magnetism
1.2Straight Wire and Coil
1.3 Solenoid
1.4 Uses of Electromagnet
2.1 Catapult Force
2.2 Application of Catapult Force
3.1 Electromagnetic Induction
3.2 DC and AC Generator
4.1 Transformer
4.2 Transformer - Calculation
5.1 Generation and Transmission of electricity

Generation and Transmission of Electricity

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1. Which of the following is not a renewable energy?
Choice 1 Hydro energy
Choice 2 Biomass
Choice 3 Geothermal energy
Choice 4 Nuclear energy

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2. Which of the following is not the advantage of using National Grid Network
Choice 1 Reduces power lost during transmission.
Choice 2 Electricity supply is more stable and reliable.
Choice 3 More secure.
Choice 4 Maintenance and repairing work can be done at anytime.

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3. It is known that some electrical energy will loss during the transmission due to the resistance in the transmission cable. The energy loss in a transmission cable is


Choice 1 directly proprotional to the square of the current in the cable
Choice 2 directly proprotional to the current in the cable
Choice 3 inversely proportional to the square of the current in the cable
Choice 4 inversely proportional to the current in the cable

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4. Which of the following is NOT TRUE about the disadvantages of using fossil fuel as a source of energy?
Choice 1 It is a non-renewable energy
Choice 2 It pollute the air
Choice 3 It releases a lot carbon dioxide when it is burned
Choice 4 It is very expensive

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5. Which of the following is NOT the problems involving electricity transmission?
Choice 1 Power loss during transmission.
Choice 2 Pylons may be strucked by lightning.
Choice 3 The high voltage transmission cable is very dangerous.
Choice 4 The high voltage cable may kill those birds accidentally step on it.

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6. In a transmission of electricity from place A to place B, the electrical energy is transmitted at the rate of 100kW and the potential difference across the cable is 20kV. Find the power loss in the transmission if the resistance of the cable is 5 Ohm.
Choice 1 80MW
Choice 2 125W
Choice 3 100kW
Choice 4 140W

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electromagnetism notes